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Question
Friday, June 13, 2008 9:11 AM | 1 vote
Hi,
This question might seem strange, but I should explain I'm attempting to unit test my code. As part of that, I'd like to simulate as many of the conditions that could be present as possible.
I'm using a library that does some networking, and one of its method may throw three exceptions. What I want to do is use mocking to simulate each exception being thrown (and correctly handled), but unfortunately one of the exception classes has been defined with only internal constructors, so I can't create an instance of it.
Is there any way I can construct an instance using reflection?
Cheers,
Adam
All replies (3)
Friday, June 13, 2008 1:18 PM âś…Answered | 3 votes
Hi Adam,
you certainly can. Here's some code:
| // Fetch the non-public instance constructors from the wanted exception type. |
| ConstructorInfo[] constructors = |
| typeof(MyInternalException).GetConstructors( |
| BindingFlags.NonPublic | BindingFlags.Instance); |
| // I expect there is only one constructor, and I invoke it, and cast the object. |
| Exception myException = (Exception)constructors[0].Invoke(null); |
| // We throw the created exception. |
| throw myException; |
I hope this helps.
Friday, June 13, 2008 1:28 PM | 1 vote
Hi Adam,
when you want to have accessible internal classes and methods in other assembly then apply InternalsVisibleToAttribute to the assembly where are internals classes. See: http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.internalsvisibletoattribute.aspx
Petr
Friday, June 13, 2008 2:03 PM
NET Junkie - thanks a lot, that worked perfectly. I knew I had to do something like that, just didn't have a chance to get it working. Thanks again.
Petr - unfortunately I have no control over the library that has the internals, but thanks for the tip.
Cheers,
Adam